. >>> there is speculation tonight that the crash that killed actor paul walker may have been caused by a mechanical failure. walker was riding in a $450,000 porsche carrera gt. tmz is reporting that the car was leaking steering fluid, and that may have explained how the driver lost control. authorities say speed may have opinion a factor and the street where it happened is a well known area for street racing. walker starred in the fast and furious movies. both he and the driver of the car were killed. >>> oakland police were asking for the public's help in finding a car stolen at gunpoint. investigators say the vehicle was taken yesterday by a man with a gun at the intersection of 24th and valdez streets. since then, officers say the car has been used in at least two armed robberies in the north oakland, and diamond neighborhoods. police say that vehicle they're look forgot a is a tan, 2005 volvo. authorities warn, if you spot that car, call police right away. the california license plate on the volvo reads 5mdf073. the people inside that vehicle should be considered armed and dange